I had a dyno done by a reputable shop and this is the result. It was a Dynojet 250. I watched it being done, 3 pulls, none of which were excessively long in duration. I was outside the sound-enclosure and did have a view of the electronic screen where the rpm's were graphically-displayed. It looked to me like the pulls went beyond 10K when they got into whatever gear they use, which I would suppose is probably 4th, as I believe that is 1:1. I think they over-revved it and smoked the rod bearing & crank on the runs. I videotaped the runs and thought I had a clear view of the computer tach simulated screen, but in playback, it is too-indistinct to show the rpm's they ran the engine to.
The engine is a totally-stock one. My bike is a 1992. I got on the bike after they took it off the dyno and parked it outside the shop. I started it up and began riding home, a distance of ~3 mi. After about 1 mi., the engine began making "rod noises." It still ran, but I figured at that point, the damage was done, so I rode it the rest of the way home.
I tore it out of the frame and took it to my friend's shop, 'Under Pressure," Dania Beach FL, where the owner Steve confirmed the #3 rod and the crank is toast. The adjoining #4 rod is not much better, but it doesn't have the ~2 MM of big-end play the #3 rod does on the crank journal. Notice the color in the area of the mortal wound.
Sadly, I doubt there is amy recourse I have against the dyno operator, as he will claim the engine was already 'hanging by a thread,' and that the dyno was the last-gasp by a bad engine. I haven't even approached them about it. Caveat emptor!
My intent was to get a baseline for some bolt-ons I was about to make, a full set of carbs Dynojet Stage 7-kitted and including K&N pods for the intake and a barely-used UFO silver-coated 4/1 w/the shorty slash-cut baffle. I wanted to be able to say, "this is what these were worth on my bike, your results may vary!"
The engine was running fine before this, no problems starting or running, I hadn't synched the carbs yet but I believe they were reasonably-close. It carbureted smoothly and cleanly, and would pull to 9K+ w/no issues whatsoever, though I wasn't in the habit of running it to redline every time I got aboard. I am also not one to make drag-racing starts and have never been to the strip to run it. So, if I had to say, it received enthusiastic use w/o being abused or raced. I didn't speed-shift. But what happened is the crank probably had a rod big-end failure due to over-revving and oil failure.
Before my mechanic disassembled it, he told me, "it's going to be #3 bearing for the connecting rod/crank." Sure-enough, it was.
So, leave well-enough alone, is my advice, I would probably be riding using the same engine today if I hadn't had the dyno test done. Do I want to lay the blame on the dyno operator? I would like to, but unfortunately I have no proof they over-revved it. :confused2::bang head::bang head::confused2::damn angry::damn angry::confused2:
The engine is a totally-stock one. My bike is a 1992. I got on the bike after they took it off the dyno and parked it outside the shop. I started it up and began riding home, a distance of ~3 mi. After about 1 mi., the engine began making "rod noises." It still ran, but I figured at that point, the damage was done, so I rode it the rest of the way home.
I tore it out of the frame and took it to my friend's shop, 'Under Pressure," Dania Beach FL, where the owner Steve confirmed the #3 rod and the crank is toast. The adjoining #4 rod is not much better, but it doesn't have the ~2 MM of big-end play the #3 rod does on the crank journal. Notice the color in the area of the mortal wound.
Sadly, I doubt there is amy recourse I have against the dyno operator, as he will claim the engine was already 'hanging by a thread,' and that the dyno was the last-gasp by a bad engine. I haven't even approached them about it. Caveat emptor!
My intent was to get a baseline for some bolt-ons I was about to make, a full set of carbs Dynojet Stage 7-kitted and including K&N pods for the intake and a barely-used UFO silver-coated 4/1 w/the shorty slash-cut baffle. I wanted to be able to say, "this is what these were worth on my bike, your results may vary!"
The engine was running fine before this, no problems starting or running, I hadn't synched the carbs yet but I believe they were reasonably-close. It carbureted smoothly and cleanly, and would pull to 9K+ w/no issues whatsoever, though I wasn't in the habit of running it to redline every time I got aboard. I am also not one to make drag-racing starts and have never been to the strip to run it. So, if I had to say, it received enthusiastic use w/o being abused or raced. I didn't speed-shift. But what happened is the crank probably had a rod big-end failure due to over-revving and oil failure.
Before my mechanic disassembled it, he told me, "it's going to be #3 bearing for the connecting rod/crank." Sure-enough, it was.
So, leave well-enough alone, is my advice, I would probably be riding using the same engine today if I hadn't had the dyno test done. Do I want to lay the blame on the dyno operator? I would like to, but unfortunately I have no proof they over-revved it. :confused2::bang head::bang head::confused2::damn angry::damn angry::confused2:
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